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LAKEWOOD, Colo. - A woman upset after a fire twirling demonstration injured her boyfriend has been sentenced to 11 years for attempted murder and arson.

Prosecutors said Rachel Dawn Lewin, 22, and her boyfriend, Lucas Jay Piper, went to a concert at Red Rocks Amphitheater in July 2013.

Prosecutors said after the concert, Lewin, Piper, and a large group of people went to a home in the 12300 block of W. Viewpoint Drive in Lakewood where a bonfire was lit and one of the residents started demonstrating his hobby of fire twirling.

Piper and two others got hurt.

"Piper became very angry and left the house, saying that he was going to come back and burn the house down," prosecutors said in a news release sent to 7NEWS.

Lewin and Piper allegedly drove to a convenience store.

Prosecutors said Lewin went inside and purchased lighter fluid.

"They returned to the house and, using the lighter fluid as an accelerant, Piper set fire to the house while nine people slept inside," prosecutors said.

Everyone got out of the home, but one person was hurt. The home sustained significant damage.

Lewin and Piper both pleaded guilty to attempted first degree murder, arson and conspiracy to commit first degree arson.

Piper was sentenced to 22 years in prison. Lewin was sentenced to 11 years.

Copyright 2014 Scripps Media, Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.